I started using Bio-Oil as soon as I learned that I was pregnant. I never developed stretch marks during my pregnancy as expected, I believe it is because my skin was always moisturised and protected at all times through using the oil. I applied it once in the morning and evening after taking a bath.
I stopped using it after giving birth because I reached my goal which was the only thing I was worried of. At this point in time I do have stretch marks but they resulted from my fluctuating weight gain and loss, but they are not that bad so it’s nothing to worry about.